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The prime mover for flexion of the shoulder muscles used are the following: 1  Pectoralis Major Clavicle. 2  Anterior Deltoid. 3  Biceps Brachii Short Head. 4  Coracobrachialis.
How can it be that one muscle extends and flexes at the shoulder? Anterior portion flexes and posterior portion extends The powerful brachilis muscle _____ the elbow.